"The location of the event is Wittbräuckerstraße/Schirrmannweg in Dortmund-Höchsten. According to current knowledge the windows of the bus (whole or partial) were shattered and one person was injured. It is not yet possible to say exactly what the explosion was or exactly where something exploded."

Spanish publication SPORT claim to have spoken to the former Barcelona defender who is "okay but in state of shock" having suffered minor wounds from glass shattering on the bus.

Marc Bartra

Dortmund's official Twitter initially reported the incident at 6:40pm [BST]. "Explosion at the team bus at the team hotel. Players are safe. No danger in and around the stadium."

The club has also asked fans already inside the stadium to remain calm as an investigation is carried out.

The decision to cancel Wednesday's match was made at 7:30pm [BST] with a statement from Uefa reading: "Following tonight's incident involving the Borussia Dortmund team bus, the Uefa Champions League match between Borussia Dortmund and AS Monaco has been postponed until tomorrow 18:45 CET.

"This decision was made after a meeting held at the Westfalenstadion between Uefa, representatives of the two clubs and local authorities."